Newall Security Mainspring #575 Waltham No. 2251 for Model 678 - Steel

Newall Security Mainspring #575 for Waltham Model 678, Factory No. 2251, steel, new in envelope. See image for precise mainspring specifications. I specialize in hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item.